Investigation and analysis of vortex and application of jet in crossflow

Chang, Jianlong; Du, Yang; Shao, Xudong; Zhao, Yongjuan; Zheng, Shizhen

doi:10.1016/j.csite.2019.100459

Cited by 12 publications

(10 citation statements)

References 34 publications

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“…There are many essential engineering applications introduced for buoyant JICFs such as film cooling of gas turbine blades, fuel atomization in scramjets, and applications involving dilution [27]. According to the main goal expected, various jet penetration levels are needed, which can be achieved by the changes in the ratios of jet to cross-flow velocity (r = U 0 U a ; U 0 is the jet discharge velocity and U a is the ambient flow velocity) and jet to cross-flow momentum flux (J = ρ 0 ρ a r; ρ 0 is the jet discharge density and ρ a is the ambient flow density) [30,35].…”

Section: Engineering Applications Of Buoyant Jet In Cross-flow (Jicf)mentioning

confidence: 99%

“…However, the momentum flux ratio is relatively low (often J < 5 or J < 1) for film cooling applications in order to be able to thermally protect turbine blades [30]. In addition, when it comes to the engineering design of buoyant JICFs, the velocity ratio can be introduced as an important aspect of lateral jet-flow structures [27].…”

Section: Engineering Applications Of Buoyant Jet In Cross-flow (Jicf)mentioning

confidence: 99%

“…Basically, the jet in cross-flow (JICF) or transverse jet is related to a jet of fluid being ejected from a nozzle and interacting with the ambient fluid flowing across the nozzle exit [27,28], with both the jet and the cross-flow being changed after their interaction [29]. The flow characteristics of the cross-flow after being hindered by the jet can be interpreted similarly to those of a flow around a circular cylinder.…”

Section: Introductionmentioning

confidence: 99%

“…The flow characteristics of the cross-flow after being hindered by the jet can be interpreted similarly to those of a flow around a circular cylinder. In addition, due to the influence of the cross-flow, the jet gets deflected, and an energy and momentum exchange between the jet and the boundary shear-layer zone of the cross-flow takes place [27]. Highly complex three-dimensional, unsteady, and nonlinear flows are generated because of the interaction between the cross-flow and the jet [22].…”

Section: Introductionmentioning

confidence: 99%

“…JICFs have a wide variety of practical applications including plume dispersion, film cooling for combustors and turbines, and discharges of sewage and industrial effluents into channels and natural rivers [22,27,30]. JICFs have also gained considerable attention in many experimental and numerical studies in fluid mechanics due to their capability to provide higher mixing in comparison with free jets [22,31].…”

Section: Introductionmentioning

confidence: 99%

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Buoyant Jets in Cross-Flows: Review, Developments, and Applications

Taherian

Mohammadian

2021

JMSE

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Significant environmental effects from the use of marine outfall discharges have led to increased efforts by both regulatory bodies and research groups to minimize the negative impacts of discharges on the receiving water bodies. Understanding the characteristics of discharges under conditions representative of marine environments can enhance the management of discharges and mitigate the adverse impacts to marine biota. Thus, special attention should be given to ambient cross-flow effects on the mixing behaviors of jet discharges. A buoyant jet in cross-flow has different practical applications such as film cooling and dilution, and provide a higher mixing capability in comparison with free jets or discharges into stationary environments. The main reason for this is believed to be the existence of various complicated vortical structures including a counter-rotating vortex pair as the jet expands downstream. Although tremendous research efforts have been devoted to buoyant jets issuing into cross-flows over the past five decades, the mixing process of an effluent at the discharge point is not yet well understood because of the highly complex fluid interactions and dispersion patterns involved. Therefore, there is a need for a deeper understanding of buoyant jets in cross-flows in order to obtain better predictive methods and more accurate design guidelines. The main aims of this study were (i) to establish the background behind the subject of buoyant jets in cross-flows including the flow structures resulting from the interaction of jets and cross-flows and the impacts of current on mixing and transport behavior; (ii) to present a summary of relevant experimental and numerical research efforts; and finally, (iii) to identify and discuss research gaps and future research directions.

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Section: Engineering Applications Of Buoyant Jet In Cross-flow (Jicf)mentioning

confidence: 99%

Section: Engineering Applications Of Buoyant Jet In Cross-flow (Jicf)mentioning

confidence: 99%